Acting FBI Director Andrew McCabe is being investigated by the Office of U.S. Special Counsel for violating The Hatch Act that prohibits FBI agents from campaigning in partisan races.

The Office of U.S. Special Counsel, the government’s main whistleblower agency, is investigating whether FBI Deputy Director Andrew McCabe’s activities supporting his wife Jill’s Democratic campaign for Virginia state senate in 2015 violated the Hatch Act’s prohibition against FBI agents campaigning in partisan races.

The agency’s probe was prompted by a complaint in April from a former FBI agent who forwarded social media photos showing McCabe wearing a T-shirt supporting his wife’s campaign during a public event and then posting a photo on social media urging voters to join him in voting for his wife.

“I am voting for Jill because she is the best wife ever,” McCabe put on a sign that he photographed himself holding. The photo was posted on her social media page a few days before the election, in response to Dr. Jill McCabe’s plea to “help me win” by posting photos expressing reasons why voters should vote for her, according to the complaint.

Other social media photos in the complaint showed McCabe’s minor daughter campaigning with her mother, wearing an FBI shirt, and McCabe voting with his wife at a polling station.

The Hatch Act prohibits FBI employees from engaging “in political activity in concert with a political party, a candidate for partisan political office, or a partisan political group.”

It defines prohibited political activity as “any activity directed at the success or failure of a partisan group or candidate in a partisan election.”

An ethics expert told Circa the photos raised legitimate questions about McCabe’s compliance with the law.

Meanwhile, Virginia Gov. Terry McAuliffe’s office released to Circa under the Freedom of Information Act documents showing McCabe attended a meeting with his wife and the governor on a Saturday in March 2015 specifically to discuss having Jill McCabe run for state Senate in Virginia as a Democrat.

“This is a candidate recruitment meeting. McCabe is seriously considering running against State Senator Dick Black. You have been asked to close the deal,” the briefing memo for McAuliffe read.

Watch Sean Hannity discuss McCabe’s involvement in his wife’s campaign as well as his ties to Hillary’s campaign:

Included in the governor’s briefing package was a copy of McCabe’s FBI biography. The biography made clear that Andrew McCabe was a senior executive who at the time oversaw the FBI’s Washington field office that among many tasks supervised investigations in northern Virginia.

At the time of the meeting, published reports indicate agents in the Washington field office were involved in both a probe of McAuliffe and of the governor’s close friend, Hillary Clinton’s and her private email account.